Year	current US$
2002	459000000
2003	470000000
2004	477000000
2005	425000000
2006	474000000
2007	480000000
2008	504000000
2009	431000000
2010	442000000
2011	446000000
2012	460000000
2013	490000000
2014	525000000
2015	529000000
2016	571000000
2017	654000000
2018	679000000
2019	687000000
2020	644000000